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| Analysis of dynamic shear modulus ratio and damping ratio of frozen silt under hierarchical dynamic loading |
| ZHAO Futang，ZHANG Wuyu，CHANG Lijun |
| (School of Civil Engineering，Qinghai University，Xining，Qinghai 810016，China) |
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Abstract Frozen soil as a subgrade for roads and railways，which stability has been widely concerned and studied. In order to seek the failure mechanism of frozen soil under traffic load，the cryogenic temperature dynamic triaxial tests is implemented under the hierarchical cyclic dynamic loading. The dynamic parameters of frozen silt soil are analyzed in detail considering different freezing temperatures，water contents，compaction degree and confining pressure. The results show that there is a good linear relationship between the reciprocal of dynamic shear modulus-strain，hyperbolic model can well express the dynamic stress-strain relationship of frozen silt. The freezing temperature and water content change have significant influence on the dynamic shear modulus and damping ratio，there are optimal freezing temperature and water content range to control their corresponding maximum or minimum values. The compaction degree and confining pressure have weak influence on dynamic shear modulus and damping ratio，the optimal range is not found.
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2020, Vol. 39 
